Charles mathie and esten asprey fletcher



(No Model.) I V G. MATHIE 8; E. A. FLETCHEIL NUT LOOK.

No, 471,875. PatnteiManZQ, 1892.

71412168868 7 v jitrni'or fZ/wm (2M awe. l Om. W a ma 7 gum/Z04 v vUNITED STAT- s PATENT OFFICE.

CHARLES MATHIE AND ESTEN ASPREY FLETCHER, OF TORONTO, CANADA.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 471,875, dated March29, 1892 Application filed May 15, 1391. fierial Nd. 392,809. (Nomodel.)

To all whom it may concern.-

Be it known that we, CHARLES MATHIE,-'

blacksmith, and EsrEN ASPREY FLETCHER, contractor, both of the city ofToronto, in the county of York, in the Province of Ontario, Canada, havejointly invented a certain new and Improved NutrLock, of which thefollowing is a specification.

The object of our invention is to design a nut-lock specially adaptedfor locking the nuts on fish-plate bolts; and it consists, essentially,of a block designed to fit between a pair of fish-plate nuts orbolt-heads and secured in position by a conically-shaped pin extendingfrom the fish-plate through a beveled slot made in the block,substantially as and for the purpose hereinafter explained and thendefinitely claimed.

Figure 1 is a perspective view of a railjoint with our improved nut-lockapplied for the purpose of locking the nuts of the fishplate bolts. Fig.2 is an enlarged cross-section through my. Fig. 3 is a perspective viewof the front face of the block. Fig. 4is a perspective view of the backface of the block.

A represents the rail; B, the fish-plate; C, nuts fitted onto thefish-plate bolts D. All these parts may be made of the ordinary shapeand style. I

E is a block fitted between the pair of nuts C. With the view ofsecuring this block in position in such a manner that it may be,

easily placed in position and removed when not required, we fix to thefish-plate B a conically-shaped pin F, thebase of the cone being at theouter end of the pin. A hole a is made through the block E sufficientlylarge to permit the end of the pin F to pass through it. A slot Z)extends vertically from this hole a. The width of the said slot on theinner surface of the block corresponds with the diameter of the pin Fclose to the fish-plate B, while the diameter of the slot on the outersurface corresponds with the diameter of the base of the cone at theouter end of the pin F. When the nuts C have been screwed home, a blockE is placed between each pair of nuts, the said block being held so thatthe end of the pin F will pass through the hole a.

When pushed against the fish-plate B, the block E is pressed down,-sothat the neck of the pin F will enter the slot 6. From this it will beseen that so long as the block E is held in the position indicatedbetween the nuts C it is impossible for the said nuts to work off. Atthe same time when it is necessary to remove the nuts the block E may beeasily raised and withdrawn from its position without in any way beinginjured.

In all other nut-locks with which we are familiar the device employedfor locking the nuts soon wears and becomes useless, and in many of themthey are destroyed the first time becomes necessary to remove the nutthey are employed to lock, Whereas by our invention the nut-lock willpractically last forever, so that the first expense is all that isnecessary to incur, no renewals being required.

Our nut-lock is specially designed for fishplate bolts; but of course itmay be used with all kinds of machinery when circumstances will permitof its employment.

We are aware of the United States Patents Nos. 149,808, 229,175, and384,767, and claim nothing shown therein, as we regard our invention asessentially dilterent from the devices shown in said patents. By ourarrangement of the conical-headed pin and the in clined sided slot thehead of the pin does not project beyond the edge of the plate E, and istherefore not likely to be knocked 01f, which is a decided advantage. I

What we claim as our invention is As an improved nut-lock, a blockE,having a hole a made through it, and a slot 19, having inclined edgesand extending from said hole, in combination with a conically-shaped pinF, fixed in a fish-plate Band fitting said slot, all constructed an darranged substantially as shown and described, and -for the purposespecified.

Toronto, April 30, 1891.

CHARLES MATHIE. ESTEN ASPREY FLETCHER.

In presence of- H. MoOoNAGHY, FRED. W. GABVIN.

